Pre-Heresy Legion organisation is really doing my head in ! An old subject I know but one that has had me doing all sorts of maths to figure the correct structure and unit designations.
Its the heresy novels fault....
When the heresy novels speak of inner circles of captins or senior commanders and their personal companys it makes me do the maths (Just finished shadows of treachery)
Here's what I've worked out regarding the Ultamarines. The aim is to help organise one of my marine armys using Space Marine 1st edition army lists as per WD126. Ive drawn upon 20 years of background fluff, fiction, novels, the Codex and what just seems right.
A Legion of aprox 250000.
Divided into 250 Chapters of 10000 ( each chapter numbed 1,2,3 etc ).
A Chapter numberd divided into 10 Grand Companys of a 1000 marines each (each grand company numbed 1,2,3 etc)
A Grand Company being divided into Regiments of aprox 300 marines each (each numbed 1,2,3 etc)
Divided into 3 battalions per regiment (each numbed 1,2,3 etc within a individual Chapter only)
Which each have 3 line companys each ( each numbed 1,2,3 etc within an individual Chapter only)
A line company having 3 detachments each. These supported at battalion level with seperate detachments.
Not forgeting regimental level support units.
My Ultramarine army consists of around two thousand marines including landraiders, mole morters. vindicators, Capitol Imperialis and every other model available to Marines (and my collection).
So, my example being,
12th Chapter
111th Grand company
331st regiment, battalions 1,2 and 3.
332nd regiment, battalions 4,5 and 6
333rd regiment, battalion 7,8 and 9
Line companys 1 to 27.
112th Grand company
334th regiment, battalions 10,11 and 12
335th regiment, battalion 13,14 and 15
336th regimant, battalion 16,17 and 18
Line comapanys 28 to 54.
If I were to go on the 12th chapter would number grand companys 111th -120th, regiments 331 -360, battalions and line comapanys 1 to well, you get the idear.
Also, I intend to add a "penal" battalion in some where. Just so I can have a body of troops with red helmets !
I want to add a 12th chapter command unit in here some where too ? A powerful commander in charge of 10 Grand companys no less. One of 250 such commanders. If anyone is interested I also have started working out unit colours, divisional and corps struture

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An interesting and fun thing of note is that inventing regiments has enabled me to use second founding forebears. My 334th regiment are the Doom Eagles. Hence their silver and red regimental theam.
Thoughts please.
